Overspeed drive no back lockout



Feb. 1, 1938. v v w. B.-BARNES 2,106,905

I OVERSPJEED DRIVE NO BACK LOCKOUT I Filed Jan. 8, 19.54

INVENTOR.

ATTORNEYS Patented res. 1, 1938 {UNITED STATES PATENT-2' OFFICE Myinvention relates to improvements in transmissions and particularly to atype of transmission wherein there is provided gearing for effecting an.overspeed drive of the propeller '5 shaft and there is also provided 'anoverrunning clutch to permit, when the parts of the transmission are ina predetermined position, a free wheeling of the vehicle.

In certain types of transmissions of this char- 10 acter. which isparticularly adapted for use in connection with the standard type oftransmission, when the driving shaft of the overdrive transmission isdriven in a reverse direction, through a reverse drive of the standardtrans- 15 mission, there is a tendency for the parts to lock- It is oneof the objects of my invention to provide means whereby in this type oftransmission when a reverse drive is effected, to prevent this golocking up of the overspeed drive. Y

For the purpose of disclosing my invention I- have illustrated certainembodiments thereof in the accompanying drawing in which Fig. 1 is alongitudinal sectional view of an 25 overspeed transmission embodying myinvention;

Fig. -2 is a transverse sectional view on theline 2-2 of Fig. 1; and

Fig. 3 is a detail view of the means for preventing a lockup of thedrive.

30 In the embodiment of the invention illustrated I have provided anoverspeed drive, which is preferably enclosed in the casing i and isadapted to be attached to the rear end of the standard transmission ofan automobile vehicle having 35 three speeds forward and one reverse. Inthe overspeed structure shown the propeller shaft 2,

which is adapted to drive the rear wheels of the.

vehicle through the usual differential, is provided with an overhangingportion 3 constituting 40 one member 4 of an overrunning clutch. Thispropeller shaft 2 has also secured on the member 3 a ring gear 5 of aplanetary overspeed drive.

The driving shaft .8 of the transmission has a' connection with theshaft of the standard trans- 4& mission which, while causing the twoshafts torotate in unison,--will permit of an axial movemerit of theshaft 6. 'Ihisdriving shaft is provided with clutch teeth 'lfat itsouter end, adapted when the shaft is moved'to'its right-hand limit,

4 50 looking at Fig. 1, to engage in internal teeth a on the member 3,whereby a direct drive is es tablished between the shaft and the shaft2. Surrounding the "shaft 6 is the inner member I of an overrunningclutch connected with'the so shaft 8 through the instrumentality ofteeth I.

'pinion carrier adapted, when the shaft 6 is shifted to'its lefthandlimit, looking at Fig. 1, to mesh with the teeth IV of the shaft 6. 15

on the clutch member and teeth 'I on the shaft- 6. This inner member isprovided with a plurality of cam surfaces l2 between which and the innersurface of the outer member 4 of the clutch are interposed suitableclutch rollers l3. Surrounding the shaft 6 is a sleeve l4 held againstrotation by a sound-dead'ehing connection I5 with the casing I and thissleeve is provided with a sun gear l6. Interpbsed between the sun gearHi and the ring gear 5,are pinion gears l I mounted on pins l8 supportedfrom a l9 having internal teeth -With the above construction it .will beseen that when the shaft 6 engages the teeth I thereof with the teeth 8on the shaft 2 a direct two-way drive will be establised between theshafts"; When, however," the shaft 6 is axially shifted slightly to theleft to disengage the teeth i from the teeth 8 a direct one-way drive isestablished between the shaft 6 and the shaft 2 through the overrunningclutch. vBy shifting the shaft 6 to 1 its left-hand limit the teeth 1engage the teeth 20 on the pinion carrier I9 and a two-way overspeeddrive is established between the shaft 6 and the shaft 2 through theplanetary gearing. The

' outer member 3 of the overrunning clutch, under these circumstances,is being driven faster than .the inner member 9. However, the directionof rotation of this outermember is in a clockwise direction, looking atFig. 2, and therefore the rollers I3 will be moved to a disengagingposition so that the .overrunning clutch will be ineffective andthereforewill not affect the operation of the parts. I I

However, with t e overspeed drive in effect, in event the direction ofrotation of the shaft 6 is reversed, as wouldbe the case where thestandard 40 transmission were shifted into reverse drive, thetendencywould be to drive the outer member of the overrunning clutch in acounter-clockwise direction at a greater speed than the inner memher andas a result the overrunning clutch would come into operation causing theparts to lock up and prevent such drive. a

In order to prevent such a contingency arislog I interpose between thepinion carrier l8 and the face of the member 3 e washer or annular ring2| provided with pins 22 which project rearwardly and behind each of therollers l8. This affect in any way theoperation of the clutch. The innerportion of the ring is provided with a plurality of teeth 23 havingtheir ends chamfered east 24 and these teeth are in a position to beengaged by the teeth I on the shaft 6. The front edges of the teeth 1are likewise chamfered as at I! so that when the shaft 6 is shiftedaxially to the left, looking at Fig. 1, the teeth I engaging the teeth23 will lock the ring or washer 2| against relative rotation andin aposition to place the pins 22 behind the rollers il in' such apositionas to prevent the rollers from moving into engaging position, thuspreventing the overrunning clutch from operating in either direction.Due to the chamfering of the 23 and the teeth '|,if the ring hasrotated,..slightly in a direction to permit the rollers 13 to operate,the teeth II and the teeth 24 may readily engage and the ring rotated-inan opposite direction. Therefore, when parts are in overspeed driveposition the overrunning clutch is rendered inoperative in eitherdirection so that in event a reverse drive is effected, through theoverspeed drive gearing, the overrunning clutch will not engage and theparts are thus prevented from looking up.

I claim as my invention: 1. In a on, the combination with a and a drivenshaft, of an overspeed geartation when the shafts are drivinglyconnected through said overspeed gearing.

2. In a transmission, the combination with driving and driven shafts, ofan overspeed gearing including a gear constantly connected to saiddriven shaft for drivingly connecting said driving and driven shafts, aone-way clutch for drivingly connected said shafts including a memberconnected to said driven shaft and means for rendering said one-wayclutch inoperative in either direction of rotation when the shafts aredrivingly connected through said overspeed gearing. 3. In atransmission, the combination with a driving and a driven shaft, of anoverspeed gearingfor drivingly connecting said shafts including agear-constantly connected to the driven shaft, a one-way clutch fordrivingly connecting said shafts including a member constantly connectedto the driven shaft and shiftable means for selectively establishing adrive through said gearing or through said one-way clutch and meansoperated by the said shiftable means for connecting said shafts throughsaid overspeed gearing for rendering said 'one-way clutch inoperative ineither direction of rotation. V 4. In a transmission, the combinationwith driving and driven shafts, of anoverspeed gearing of the planetarytype including a ring gear connected to said driven shaft for drivinglyconnecting said shafts, a one-way' clutch including one member connectedto said driven shaft, means for selectively establishing a drive betweensaid shafts through said gearingor through said 5. In a transmission,the combination with a driving shaft and a driven shaft, of agearing fordrivingly connecting said shafts, including a ring gear connected to thedriven shaft, pinion gears adapted to be drivingly connected'to thedriving shaft and a stationary sun gear, a oneway clutch including amember connected to the driven shaft and a second member adapted to beconnected to the driving shaft, means for selectively driving the drivenshaft through said overspeed gearing or said one-way clutch, and 25means for rendering said one-way clutch inoperative in either directionof rotation when the driving connection is established through saidgearing.

6. In atransmission, the combination with driving and driven shafts, ofa gearing for drivingly connecting said shafts, comprising a ring gearconnected to said driven shaft, a sun gear stationarily mounted, piniongears interposed be-' tween said sun and ring gear, means for connectingsaid pinion gears to the driving shaft, an overrunning clutch includingan outer member connected to the driven shaft, an inner meniber adaptedto be connected to the driving shaft,

clutch rollers interposed between said members, 4

stop members and means for moving said stop members in a position toprevent the operation of said rollers when driving connection iseffected through said gearing.

7. In a, transmission, the combination with 5 driving and driven shafts,of a ring gear con nected to the driven shaft, a sun gear stationariivmounted, pinion gears interposed between said sun and ring gears, anouter member of an overrunningclutch connected to the driven shaft, 0

an inner' member of the overrunning clutchadapted to be connected to thedriving shaft, clutch rollers interposed between said members, stopmembers and meansfor moving said stop members to a pofltion to rendersaid rollers inu

